Berkeley Software Design Inc. (BSDI or, later, BSDi) was a corporation which developed, sold licenses for, and supported BSD/OS (originally known as BSD/386), a commercial and partially proprietary variant of the BSDUnixoperating system for PC compatible (and later, other) computer systems. The name was chosen for its similarity to "Berkeley Software Distribution" the source of its primary product (specifically 4.3BSD Networking Release 2).

BSD/386 was released in January 1992. The full system, including source code retailed at $995, which was more affordable than the equivalent source code license for the rival UNIX System V from AT&T (which cost more than $20,000 in the late 1980s.)[3] Under Rob Kolstad's direction, the company decided to pursue internet infrastructure as their primary customer audience. In the mid 1990s the top-10 websites in the world were almost all using BSD/386 as their BSD source codebase.[4]

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In late 1991, AT&T's Unix System Laboratories (USL) brought a lawsuit against BSDI, alleging that BSD/386 contained their proprietary trade secrets and source code. When USL were acquired by Novell, a settlement was reached in January 1994. BSDI agreed to base future releases of the product, now called BSD/OS, on the CSRG's 4.4BSD-Lite release which was declared free of any USL intellectual property.[3] Rob Kolstad (of the University of Illinois and Convex Computer Corporation) was president of BSDI during this period and headed the company until the close of the decade.

In 1999, the BSDI employees sought an Initial public offering and installed a new president to reach this goal as soon as possible given the recent success of the Red Hat IPO in the Linux market. Unfortunately, this strategy was not successful and soon after Rob Kolstad had exited the company, it was facing bankruptcy.

In 2001, under severe financial pressure from excessive leverage, BSDI (known as BSDi by that time) sold its software business unit (comprising BSD/OS and the former Walnut Creek FreeBSD and Slackware Linux open source offerings) to Wind River Systems and renamed the remainder iXsystems with a renewed focus on server hardware.[6] Wind River dropped sponsorship of Slackware soon afterwards.[7] and the FreeBSD unit was divested as a separate entity FreeBSD Mall, Inc. in 2002.[8]

Faced with competition from FreeBSD and Linux-based operating systems, Wind River discontinued BSD/OS in December 2003 but many of its technologies live on in community-lead BSD derivatives like FreeBSD.[9]